Article
Multidisciplinary Sciences
Yahel Horowicz, Or Katz, Oren Raz, Ofer Firstenberg
Summary: Phase transitions are emergent phenomena driven by microscopic interactions that lead a system into a collectively ordered phase. In the system of warm cesium spins driven by linearly polarized light, a second-order phase transition accompanied by critical behavior was observed. The study demonstrates the power-law dependence of magnetization and divergence of susceptibility near the phase boundaries, and a critical slowdown of spin response time out of equilibrium.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
C. Zu, F. Machado, B. Ye, S. Choi, B. Kobrin, T. Mittiga, S. Hsieh, P. Bhattacharyya, M. Markham, D. Twitchen, A. Jarmola, D. Budker, C. R. Laumann, J. E. Moore, N. Y. Yao
Summary: The study demonstrates direct control over the emergent spin diffusion coefficient by tuning the underlying parameters within the spin Hamiltonian. It investigates the emergence of classical properties of a solid from its underlying microscopic quantum description through a hybrid solid-state platform.
Article
Physics, Multidisciplinary
Francesco Carnazza, Federico Carollo, Dominik Zietlow, Sabine Andergassen, Georg Martius, Igor Lesanovsky
Summary: In the study of many-body quantum systems, it is often sufficient to consider the dynamical or stationary properties of local observables. By formulating the problem of finding the generator of the subsystem dynamics as a variational problem and using machine learning techniques, we are able to learn a physically consistent open quantum time-evolution and predict the stationary state of the subsystem dynamics.
NEW JOURNAL OF PHYSICS
(2022)
Article
Quantum Science & Technology
Tian-Xing Zheng, Anran Li, Jude Rosen, Sisi Zhou, Martin Koppenhoefer, Ziqi Ma, Frederic T. T. Chong, Aashish A. Clerk, Liang Jiang, Peter C. Maurer
Summary: In this study, a variational method is developed to generate metrological states in small dipolar-interacting spin ensembles with limited qubit control. The generated states enable sensing beyond the standard quantum limit (SQL) and are applicable to finite spin polarization and non-Markovian noise environments.
NPJ QUANTUM INFORMATION
(2022)
Article
Multidisciplinary Sciences
T. -W. Zhou, G. Cappellini, D. Tusi, L. Franchi, J. Parravicini, C. Repellin, S. Greschner, M. Inguscio, T. Giamarchi, M. Filippone, J. Catani, L. Fallani
Summary: The Hall effect, which describes the motion of charged particles in magnetic fields, has important implications for material properties. Understanding this effect in interacting systems is challenging, even for small magnetic fields. In this study, we used an atomic quantum simulator to investigate the behavior of ultracold fermions in the presence of artificial magnetic fields. Through experimental measurements, we observed a universal behavior of the Hall response, which is independent of the strength of atomic interactions. This research demonstrates the capability of quantum simulation to describe strongly correlated topological states of matter.
Article
Physics, Multidisciplinary
B. Krajewski, L. Vidmar, J. Bonca, M. Mierzejewski
Summary: In this study, we investigate a chain of interacting fermions with random disorder in the context of many-body localization. Our findings indicate that only a small fraction of the interaction can be considered as a true local perturbation to the Anderson insulator, and this perturbation decreases with increasing disorder strength. This suggests that strongly disordered systems can be viewed as weakly perturbed integrable models, namely weakly perturbed Anderson insulators. Additionally, we introduce a rescaled model where the true perturbation is of the same order of magnitude as the other terms in the Hamiltonian, and we demonstrate that the system remains ergodic at arbitrary large disorder.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Damian Wlodzynski, Tomasz Sowinski
Summary: It has been argued that one-dimensional systems of strongly interacting fermions of different mass undergo critical transitions between spatial orderings when external confinement adiabatically changes shape. When considering finite-time drivings, the dynamics are typically guided by the lowest eigenstates and can be understood through the generalized Landau-Zener mechanism. By adjusting driving parameters, it is possible to target the desired many-body state in a noninfinite time.
Article
Astronomy & Astrophysics
Stephon Alexander, Evan McDonough, David N. Spergel
Summary: The study explores the implications of an ultra-light fermionic dark matter candidate carrying baryon number, with a focus on the formation of exotic states of matter and its impact on dark matter halos. The model of dark baryons based on a non-Abelian gauge group presents a unique solution to the core-cusp problem in collisionless cold dark matter. By utilizing dense quark matter equations of state, the research finds halo cores consistent with observations of dwarf galaxies, suggesting a potential resolution to longstanding astrophysical mysteries.
Article
Physics, Applied
Zitong Xu, Kai Wei, Xing Heng, Xiaofei Huang, Yueyang Zhai
Summary: Spin manipulation and detection of strongly interacting ensembles in SERF comagnetometers with different species combinations have been comprehensively studied. A model of strong coupling point is established and verified experimentally. The K-Rb-21Ne comagnetometer shows better potential in inertial measurement.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Ruotian Gong, Guanghui He, Xingyu Gao, Peng Ju, Zhongyuan Liu, Bingtian Ye, Erik A. Henriksen, Tongcang Li, Chong Zu
Summary: In this study, we investigated the coherent dynamics of strongly interacting ensembles of negatively charged boron vacancy (V-B(-)) centers in hexagonal boron nitride (hBN). By selectively isolating different dephasing sources, we observed significant improvement in the measured coherence times and estimated the concentration of V-B(-). Additionally, we studied the spin response of V-B(-) to local charged defects induced electric field signals.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Thomas Fogarty, Miguel Angel Garcia-March, Lea F. Santos, N. L. Harshman
Summary: The study proposes a minimal chaos model that can be experimentally realized with cold atoms trapped in one-dimensional multi-well potentials, investigating the emergence of chaos as the number of particles and wells increases. It reveals a narrow boundary between integrability and chaos in a highly tunable few-body system, showing subtle indications of quantum chaos for 3 particles and stronger signatures for 4 particles. The analysis is performed for bosonic particles and has the potential to be extended to distinguishable fermions.
Article
Physics, Multidisciplinary
Chris Nill, Kay Brandner, Beatriz Olmos, Federico Carollo, Igor Lesanovsky
Summary: When atoms are excited to high-lying Rydberg states, their interactions with dipolar forces play a significant role. These interactions not only affect the dissipative effects caused by the coupling of Rydberg atoms with the surrounding electromagnetic field, but also modify the frequency of emitted photons, making it dependent on the local neighborhood of the emitting atom. The interactions among Rydberg atoms accelerate decoherence and affect dissipative phase transitions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Xiang-Pei Liu, Xing-Can Yao, Youjin Deng, Xiao-Qiong Wang, Yu-Xuan Wang, Chun-Jiong Huang, Xiaopeng Li, Yu-Ao Chen, Jian-Wei Pan
Summary: Researchers generated a large number of vortices in a fermionic superfluid and observed their annihilation dynamics and spatial distribution. The vortices were found to follow algebraic scaling laws with exponents consistent with two-dimensional universality. Simulations of the classical XY model showed good agreement between numerical and experimental behaviors.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Tatsuhiko N. Ikeda, Anatoli Polkovnikov
Summary: This study focuses on the heating dynamics in isolated quantum many-body systems driven periodically at high frequency and large amplitude. The developed Floquet FGR equation accurately describes the heating dynamics, even under strong drives, with weak dependence on system size. During heating, the system approximately maintains a thermal state with a gradually increasing temperature.
Article
Physics, Multidisciplinary
Kuljeet Kaur, Theo Sepulcre, Nicolas Roch, Izak Snyman, Serge Florens, Soumya Bera
Summary: Superconducting circuits are developed as a versatile platform for exploring manybody physics, based on nonlinear elements idealized as two-level qubits. However, the intrinsic multilevel structure of superconducting qubits restricts the validity of the spin-boson paradigm. Numerical renormalization group simulations show that the quantum critical point moves out of the physically accessible range in the multilevel regime. Imposing charge discreteness in a simple variational state accounts for these multilevel effects.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
R. E. Barfknecht, A. Foerster, N. T. Zinner
Article
Physics, Multidisciplinary
R. E. Bariknecht, A. Foerster, N. T. Zinner
NEW JOURNAL OF PHYSICS
(2018)
Article
Optics
M. Iversen, R. E. Barfknecht, A. Foerster, N. T. Zinner
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Particles & Fields
Hrachya M. Babujian, Angela Foerster, Michael Karowski
Summary: The high energy behavior of the SU(N) chiral Gross-Neveu model in 1 + 1 dimensions was investigated, showing that the model is integrable and matrix elements of several local operators (form factors) are known. The form factors exhibit rapidity space clustering, indicating factorization when a group of rapidities is shifted to infinity, and explicit factorization formulas are presented for several operators in the SU(N) model.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Daniel S. Grun, Karin Wittmann W., Leandro H. Ymai, Jon Links, Angela Foerster
Summary: The ability to prepare non-classical states reliably is crucial for the realization of quantum technology, and NOON states have emerged as a leading candidate for various applications. This paper demonstrates how to generate NOON states in a model of dipolar bosons and discusses the physical feasibility using ultracold dipolar atoms. The authors propose two protocols, one deterministic and the other probabilistic, for generating arbitrary NOON states in ultra-cold atom systems.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Rafael E. Barfknecht, Angela Foerster, Nikolaj T. Zinner, Artem G. Volosniev
Summary: Theoretical and experimental studies of the interaction between spins and temperature are crucial for advancing spin caloritronics. In this work, a cold-atom simulator is proposed to study this interaction, focusing on the dynamics of a spin impurity introduced into a one-dimensional spin chain between two temperature reservoirs. The research explores the effect of temperature on spin currents, with potential applications in next-generation spintronic devices.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
D. S. Grlin, L. H. Ymai, K. W. Wittmann, A. P. Tonel, A. Foerster, J. Links
Summary: High sensitivity quantum interferometry requires a deep understanding of quantum correlations, which can be achieved through integrable models. By designing interferometric protocols, the quantum dynamics of the system can be described and its functionality and equivalence can be revealed.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Karin Wittmann W, E. R. Castro, Angela Foerster, Lea F. Santos
Summary: The onset of quantum chaos in triple-well potential systems of interacting bosons is investigated. Even in its chaotic regime, the system exhibits features reminiscent of integrability.
Article
Physics, Multidisciplinary
Kelei Tian, Jingsong He, Angela Foerster
ROMANIAN REPORTS IN PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Ovidiu Patu, Andreas Kluemper, Angela Foerster
Article
Materials Science, Multidisciplinary
R. E. Barfknecht, S. E. Rasmussen, A. Foerster, N. T. Zinner
Article
Optics
D. W. S. Carvalho, A. Foerster, M. A. Gusmao
Article
Physics, Multidisciplinary
Arlei P. Tonel, Leandro H. Ymai, Karin W. Wittmann, Angela Foerster, Jon Links
SCIPOST PHYSICS CORE
(2020)
Article
Physics, Multidisciplinary
Karin Wittmann Wilsmann, Leandro H. Ymai, Arlei Prestes Tonel, Jon Links, Angela Foerster
COMMUNICATIONS PHYSICS
(2018)
